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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76ddb2cd62a405bb22f3ee1343e87f4704ab5437d757d4a0e4cf76d49ef69d4e' 
  AND token = '7sQcLnAxIILryUON6g9uMNWM4/n0HGvDifx+6Qu0voA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}